CN210323718U

CN210323718U - Reflective marker for motion capture

Info

Publication number: CN210323718U
Application number: CN201921008295.1U
Authority: CN
Inventors: 区志华; 郭胜男; 许秋子
Original assignee: Shenzhen Realis Multimedia Technology Co Ltd
Current assignee: Shenzhen Realis Multimedia Technology Co Ltd
Priority date: 2019-07-01
Filing date: 2019-07-01
Publication date: 2020-04-14
Anticipated expiration: 2029-07-01

Abstract

The utility model provides a reflective marker for motion capture, comprising: a first translucent material, a first reflective material, an upper hemisphere, a connecting post, a lower hemisphere, a second reflective material and a second translucent material. The first light-transmitting material is covered on the first light-reflecting material, the first light-reflecting material is arranged on the surface of the upper hemisphere, the upper hemisphere and the lower hemisphere are connected together by the connecting column, and the second light-reflecting material is The material is arranged on the surface of the lower hemisphere, the second light-transmitting material is covered on the second light-reflecting material, and the first light-transmitting material and the second light-transmitting material are green or blue. Compared with the reflective marker in the prior art, the solution gives the marker green or blue, so that the color of the marker can be consistent with the background color of the cutout, and the authenticity effect of the picture is guaranteed.

Description

Reflective marker for motion capture

Technical Field

The utility model belongs to the technical field of the motion is caught, especially, relate to a reflection of light marker for motion is caught.

Background

The optical motion capture technology principle is that a tracker is arranged at a key position of a moving object, the position of the tracker is captured by a motion capture system, and three-dimensional space coordinate data of the moving object is obtained after the three-dimensional space coordinate data is processed by a computer. The tracker is one of the key components of the motion capture system, is also called Marker point (mark point), reflective ball, rigid body, etc., and usually uses a reflective ball coated with highly reflective material, which can be adhered to, for example, each main joint of human body, and infrared light emitted by the motion capture lens is reflected to the motion capture camera through the reflective ball, thereby performing mark detection and spatial positioning.

The motion capture technology can be applied to the fields of animation production, gait analysis, biomechanics, human engineering and the like, for example, in the field of animation production, a light reflecting ball is arranged on a real actor, after the light reflecting ball reflects irradiated infrared light, a motion capture system can capture the motion of the real actor, then the real actor is scratched out to realize the motion reduction, and the motion is rendered on a corresponding virtual image body, so that the animation effect on a screen is presented. However, the reflective ball in the prior art is generally a gray or white sphere, and the matting background is generally green or blue, so that the form of the reflective ball is often easily left during matting, thereby affecting the appearance authenticity.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a thereby solve among the prior art the difficult problem that influences the authenticity of scratching of reflection of light ball, provide a reflection of light marker for action is caught.

In order to solve the above problem, the utility model discloses a technical scheme as follows:

a retro-reflective marker for motion capture, comprising: first printing opacity material, first reflecting material, episphere, spliced pole, lower hemisphere, second reflecting material and second printing opacity material, first printing opacity material covers on the first reflecting material, first reflecting material sets up last hemisphere surface, the episphere passes through with the lower hemisphere the spliced pole links together, second reflecting material sets up lower hemisphere surface, second printing opacity material covers on the second reflecting material, first printing opacity material is green or blue with second printing opacity material.

Optionally, the first light-transmitting material and the second light-transmitting material may be the same or different, and have dense holes for transmitting light.

Optionally, the first and/or second light transmissive material comprises organza.

Optionally, the green color may be selected according to a pantone color card, and the green color may be matte or bright.

Optionally, the first and second light reflecting materials may be the same or different, and the upper and/or lower hemispheres may be hollow and/or solid.

The utility model provides a reflective marker of another kind of structure still includes support column and base, the lower hemisphere passes through the support column is fixed on the base.

Optionally, the base may be a green or blue magic tape, or may be a double-sided tape.

Alternatively, the reflective marker may be a reflective ball, and a plurality of reflective balls fixed on one device may form a rigid body, and the rigid body may be green or blue.

Optionally, the rigid body includes at least three light-reflecting spheres with different distribution directions, and the three light-reflecting spheres represent three directions of spatial coordinates XYZ.

The utility model has the advantages that: the utility model provides a pair of a reflection of light marker for action is caught, this reflection of light marker mainly is applied to optical action and catches and keying technical field, through adopting high reflecting material, green or blue printing opacity material, and cover it on the marker surface, thereby reach the effect that can better reflection infrared light can be convenient for keying the picture again and handle, compare in prior art's reflection of light marker, this scheme gives the marker green or blue, make it can be unanimous with keying the background colour, picture authenticity effect has been guaranteed.

Drawings

Fig. 1 is a schematic diagram of an explosion structure of a reflective marker according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a reflective marker according to an embodiment of the present invention.

Fig. 3 is a view of an application scene of the reflective marker according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a rigid body structure according to an embodiment of the present invention.

Detailed Description

The present invention will be described in detail with reference to the following embodiments, which are not intended to limit the scope of the present invention, so as to better understand the present invention. In addition, it should be noted that the drawings provided in the following embodiments are only for illustrating the basic concept of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the shape, number and proportion of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.

It will be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be considered limiting of the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Fig. 1 is according to the utility model discloses a reflection of light marker explosion structure sketch map, for the convenience to scratch the reflection of light ball simultaneously with the unanimous convenience of scratching the picture background, need make reflection of light ball present green or blue, this scheme sets up green printing opacity material on reflection of light ball surface, as shown in fig. 1, reflection of light marker from top to bottom specifically includes: a first light transmissive material 101, a first light reflective material 102, an upper hemisphere 103, a connection post 104, a lower hemisphere 105, a second light reflective material 106, a second light transmissive material 107, and the like. First printing opacity material 101 covers on first reflecting material 102, the cover is including pasting or mode such as parcel, first reflecting material 102 sets up on last hemisphere 103 surface, last hemisphere 103 links together through spliced pole 104 with lower hemisphere 105, thereby can set up the screw thread on the spliced pole 104 and match the upper and lower hemisphere with the inside screw thread of upper and lower hemisphere, also can be fixed with spliced pole 104 one end and the inside of upper hemisphere 103 or lower hemisphere 105, then spliced pole 104 inserts inside another upper hemisphere or lower hemisphere thereby make upper and lower hemisphere connect, spliced pole 104 generally adopts aluminum alloy material. Similarly, a second light reflecting material 106 is disposed on the surface of the lower hemisphere 105, and a second light transmitting material 107 is covered on the second light reflecting material 106. The first light-transmitting material 101 and the second light-transmitting material 107 may be the same or different, for example, an ougen gauze having dense holes for transmitting light, and the color may be arbitrarily selected in the green range according to the pantone color card, for example, the first light-transmitting material 101 is an ougen gauze, and the second light-transmitting material 107 is another light-transmitting film, and the embodiment is not limited herein. Similarly, the first reflective material 102 and the second reflective material 106 may be the same or different, such as glass bead reflective films, etc., while ensuring consistent infrared light reflecting properties. The upper and lower hemispheres can be hollow or solid, and the materials can be the same or different, for example, the ABS material, so long as the requirement of adhering the reflecting material is met.

It should be noted that the first light-transmitting material 101 and the second light-transmitting material 107 are generally green materials covering the surface of the sphere, and the green light-transmitting material may be matte or bright as long as it is within the pantone color card green number. Of course, blue can be used instead of green, but considering the issue of the blue eye of the euro, green is usually chosen as the color best for easy matting.

Fig. 2 is a schematic structural view of a reflective marker according to an embodiment of the present invention, the reflective marker including: the upper hemisphere 201 and the lower hemisphere 202 have good infrared light reflection performance, so that the motion capture system can accurately identify and track, the upper hemisphere 201 and the lower hemisphere 202 can be the same or different in size, and the upper hemisphere and the lower hemisphere are fixed on the base through the supporting column 203. The supporting columns 203 and the base 204 can be installed together at a certain angle, such as a right angle or other angles, the shape and size of the supporting columns 203 are not limited, the upper hemisphere 201 and the lower hemisphere 202 can be connected together by a connection method such as a screw thread or a buckle to form a sphere, i.e., a reflective sphere, the diameter of the sphere is generally 14mm or 19mm, and the reflective sphere, the supporting columns 203 and the base 204 can be integrally formed by injection molding or can be separated from each other. The base 204 can be a green or blue magic tape, and can also be other materials such as double faced adhesive tape, and the size of the base 204 should be as small as possible, so that the phenomenon that the area occupying the target object is too large, and the authenticity is influenced due to too much information of the target object being scratched when the target object is scratched is avoided. The colors of the base 204, the supporting column 203 and the sphere are green or blue, so that subsequent matting processing is facilitated. In another embodiment, the reflective ball may be directly fixed to the target object using a green or blue band with light transmission.

Fig. 3 is a view of an application scene of the reflective marker according to an embodiment of the present invention. The reflective marker is generally spherical, quasi-spherical or in other shapes, the spherical marker is a reflective ball, the spherical marker is generally set to be spherical, calculation processing and precision are facilitated, and if the reflective marker is in other shapes, when the reflective marker is arranged on a human body, for example, the mobile capture camera is likely not to be capable of shooting an information picture at a certain angle. As shown in fig. 1, a certain field is selected, which may be an indoor room or an outdoor field with weak ambient light intensity, a plurality of motion capture cameras 302 are arranged above the field, the cameras 302 may project infrared light to the reflective balls 303, and the reflective balls 303 may reflect the infrared light to the motion capture cameras 302, thereby capturing the motion trajectory of the reflective balls 303. The plurality of light reflecting balls 303 may be adhered or bound to the human body 301, and generally, the light reflecting balls 303 are disposed at each joint of the human body 301, for example, the head, the elbow, the palm, the knee, the ankle, and the like, and the motion trajectory of the light reflecting balls 303 captured by the motion capture system is the pose change of the human body 301. In order to capture the motion of the target object more accurately and more simply, a plurality of reflecting balls 303 may be fixed on a device to form a rigid body, for example, at least three reflecting balls 303 with different directions are mounted on a fixed base, and the corresponding reflecting balls 303 may be supported by supporting rods facing different directions, and the three reflecting balls 303 represent three directions of XYZ spatial coordinates, so as to realize the calculation of three-dimensional spatial coordinate data of the moving object.

In one embodiment, the rigid bodies can be bound to the head, the hands, the feet and the back of the experiencer, the tracking and positioning software can receive the transmitted rigid body data (such as the position and orientation information of the rigid bodies) on the experiencer, so as to obtain the limb end position of the experiencer, then the IK (inverse kinematics) technology and the HSM (hardware safety module) model are combined to perform the whole body skeleton solution, and finally the whole body action skeleton posture of the experiencer is estimated.

In the 3D animation process, in order to present a more realistic effect, it is often necessary to collect motion situations of some people or moving props, the collected people or props need to be subjected to matting, and then the motions of the people or props are restored to virtual objects, which is the motion capture process, so as shown in fig. 3, a green or blue background 304 and the like which is convenient for matting needs to be arranged around the field. If the color of the reflective marker is inconsistent with the background color, the marker is left on the person or the prop when the matting processing is carried out, so that the beauty and reality of the virtual object are influenced undoubtedly when the matting person or the prop is restored to the virtual object or the virtual environment.

Fig. 4 is a schematic diagram of a rigid body structure according to an embodiment of the present invention, the rigid body including: the light reflecting device comprises a plurality of light reflecting balls 401, a support rod 402, a chassis 403 and the like, wherein the light reflecting balls 401 are installed on the support rod 402, the light reflecting balls 401 and the support rod 402 can be integrally formed by injection molding or can be formed separately, the length of the support rod 402 is not limited, and the light reflecting balls are installed on the chassis 403. As described above, at least three light reflecting balls 401 representing different orientations are generally required to be disposed so as to capture information in three directions of XYZ, that is, posture change information, and it is needless to say that four or more light reflecting balls 401 may be disposed, and in principle, the more the disposition, the higher the capturing accuracy, the more the chassis 403 is disposed, the more the target object is disposed, the more the capturing accuracy is, the pose information of the target object can be determined by capturing the motion trajectory of the rigid body. In order to facilitate the matting processing, the plurality of reflective balls 401, the supporting rods 402 and the chassis 403 should be set to be green or blue, the transparent material shown in fig. 1 can be integrally covered on the surfaces of the reflective balls 401 and the supporting rods 402, and the size of the chassis 403 is not too large, so that too much information of the target object is prevented from being scratched.

Be different from prior art, the embodiment of the utility model provides a reflection of light marker for action is caught, this reflection of light marker is mainly applied to optical action and picks up and keying out technical field, through adopting high reflecting material, green or blue printing opacity material, and cover it on the marker surface, thereby reach the effect that can better reflection infrared light can be convenient for again to pick up and handle, compare in prior art's reflection of light marker, this scheme gives the marker green or blue, make it can be unanimous with keying out the background colour, picture authenticity effect has been guaranteed.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the technical field of the utility model belongs to the prerequisite of not deviating from the utility model discloses, can also make a plurality of equal substitution or obvious variants, performance or usage are the same moreover, all should regard as belonging to the utility model's scope of protection.

Claims

1. A retro-reflective marker for motion capture, comprising: first printing opacity material, first reflecting material, episphere, spliced pole, lower hemisphere, second reflecting material and second printing opacity material, first printing opacity material covers on the first reflecting material, first reflecting material sets up last hemisphere surface, the episphere passes through with the lower hemisphere the spliced pole links together, second reflecting material sets up lower hemisphere surface, second printing opacity material covers on the second reflecting material, first printing opacity material is green or blue with second printing opacity material.

2. The retro-reflective marker for motion capture as set forth in claim 1, wherein said first light transmissive material is the same or different than said second light transmissive material and has a dense pattern of holes for transmitting light therethrough.

3. A retro-reflective marker for motion capture as claimed in claim 1 or claim 2, wherein said first and/or second light transmissive material comprises organza.

4. The retro-reflective marker for motion capture as claimed in claim 1, wherein said green color is selected from a pantone color card, and said green color is either matte or bright.

5. The retro-reflective marker for motion capture as set forth in claim 1, wherein said first retro-reflective material and said second retro-reflective material are the same or different, and said upper hemisphere and/or said lower hemisphere are hollow and/or solid.

6. The retro-reflective marker for motion capture as set forth in claim 1, wherein: the lower hemisphere is fixed on the base through the supporting column.

7. The retro-reflective marker for motion capture as set forth in claim 6, wherein said base is a green or blue magic tape.

8. The retro-reflective marker for motion capture as set forth in claim 1, wherein said retro-reflective marker is a retro-reflective ball, a plurality of said retro-reflective balls being affixed to a device to form a rigid body, said rigid body being either green or blue.

9. The retro-reflective marker for motion capture as set forth in claim 8, wherein said rigid body comprises at least three retro-reflective spheres of different orientations, said three retro-reflective spheres representing three orientations of XYZ spatial coordinates.